Small-scale, continuously operated processes are a hot research topic in the chemical industry for rapid process development and production of small amounts. The contribution describes a construction kit system for continuously operated chemical reactors consisting of chip or plate reactors for fast mixing, capillary or coil tube reactors for defined residence time, as well as continuous stirred tank reactors. The involved phases of the chemical system determine the reasonably deployed elements or modules and enable therefore the setup of a flexible multipurpose plant.